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Fix SIGPIPE handling. Now that we use may use pipes for stdin/stdout

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we need to pass any SIGPIPE we receive to the running command.
This commit is contained in:
Todd C. Miller
2010-05-11 08:59:59 -04:00
parent 02f8c187a5
commit cafc6a4f66
1 changed files with 19 additions and 12 deletions
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31
src/script.c
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@@ -413,12 +413,13 @@ io_buf_new(int rfd, int wfd, int (*action)(char *, unsigned int),
/*
* Read/write iobufs depending on fdsr and fdsw.
* Returns the number of errors.
*/
static int
perform_io(struct io_buffer *iobufs, fd_set *fdsr, fd_set *fdsw)
{
struct io_buffer *iob;
int n = 0;
int n, errors = 0;
for (iob = iobufs; iob; iob = iob->next) {
if (iob->rfd != -1 && FD_ISSET(iob->rfd, fdsr)) {
@@ -445,14 +446,24 @@ perform_io(struct io_buffer *iobufs, fd_set *fdsr, fd_set *fdsw)
iob->len - iob->off);
} while (n == -1 && errno == EINTR);
if (n == -1) {
if (errno == EPIPE) {
/* other end of pipe closed */
if (iob->rfd != -1) {
close(iob->rfd);
iob->rfd = -1;
}
close(iob->wfd);
iob->wfd = -1;
continue;
}
if (errno != EAGAIN)
break;
errors++;
} else {
iob->off += n;
}
}
}
return n == -1 ? -1 : 0;
return errors;
}
/*
@@ -511,11 +522,6 @@ script_execve(struct command_details *details, char *argv[], char *envp[],
zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
/* Ignore SIGPIPE, check errno instead... */
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, NULL);
/* Note: HP-UX select() will not be interrupted if SA_RESTART set */
sa.sa_flags = 0; /* do not restart syscalls */
sa.sa_handler = handler;
@@ -523,6 +529,7 @@ script_execve(struct command_details *details, char *argv[], char *envp[],
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGPIPE, &sa, NULL);
sigaction(SIGQUIT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
@@ -811,7 +818,7 @@ script_execve(struct command_details *details, char *argv[], char *envp[],
}
}
}
if (perform_io(iobufs, fdsr, fdsw) == -1)
if (perform_io(iobufs, fdsr, fdsw) != 0)
break;
}
@@ -860,6 +867,7 @@ deliver_signal(pid_t pid, int signo)
case SIGKILL:
_exit(1); /* XXX */
/* NOTREACHED */
case SIGPIPE:
case SIGHUP:
case SIGTERM:
case SIGINT:
@@ -929,9 +937,8 @@ script_child(const char *path, char *argv[], char *envp[], int backchannel, int
sigaction(SIGWINCH, &sa, NULL);
sigaction(SIGALRM, &sa, NULL);
/* Ignore any SIGTT{IN,OU} or SIGPIPE we get. */
/* Ignore any SIGTTIN or SIGTTOU we get. */
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, NULL);
sigaction(SIGTTIN, &sa, NULL);
sigaction(SIGTTOU, &sa, NULL);
@@ -1198,7 +1205,7 @@ flush_output(struct io_buffer *iobufs)
continue;
error(1, "select failed");
}
if (perform_io(iobufs, fdsr, fdsw) == -1)
if (perform_io(iobufs, fdsr, fdsw) != 0)
break;
}
efree(fdsr);